Update 3 files

- /_layouts/xslt_container.html
- /_layouts/xslt.html
- /feed.xslt.xml

_layouts/xslt_container.html

@@ -1,4 +1,5 @@
 {% if page.layout == "xslt" %}<?xml version="1.0" encoding="utf-8"?>
+<?xml-stylesheet type="text/xml" href="/feed.xslt.xml"?>
 <xsl:stylesheet
     version="3.0"
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform"